1 | .. SPDX-License-Identifier: CC-BY-SA-4.0 |
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2 | |
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3 | .. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR) |
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4 | |
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5 | Memory Commands |
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6 | *************** |
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7 | |
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8 | Introduction |
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9 | ============ |
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10 | |
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11 | The RTEMS shell has the following memory commands: |
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12 | |
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13 | - mdump_ - Display contents of memory |
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14 | |
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15 | - wdump_ - Display contents of memory (word) |
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16 | |
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17 | - ldump_ - Display contents of memory (longword) |
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18 | |
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19 | - medit_ - Modify contents of memory |
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20 | |
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21 | - mfill_ - File memory with pattern |
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22 | |
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23 | - mmove_ - Move contents of memory |
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24 | |
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25 | - malloc_ - Obtain information on C Program Heap |
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26 | |
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27 | Commands |
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28 | ======== |
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29 | |
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30 | This section details the Memory Commands available. A |
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31 | subsection is dedicated to each of the commands and |
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32 | describes the behavior and configuration of that |
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33 | command as well as providing an example usage. |
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34 | |
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35 | .. raw:: latex |
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36 | |
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37 | \clearpage |
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38 | |
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39 | .. _mdump: |
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40 | |
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41 | mdump - display contents of memory |
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42 | ---------------------------------- |
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43 | .. index:: mdump |
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44 | |
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45 | SYNOPSYS: |
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46 | .. code-block:: shell |
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47 | |
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48 | mdump [address [length [size]]] |
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49 | |
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50 | DESCRIPTION: |
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51 | This command displays the contents of memory at the ``address`` and |
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52 | ``length`` in ``size`` byte units specified on the command line. |
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53 | |
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54 | When ``size`` is not provided, it defaults to ``1`` byte units. Values of |
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55 | ``1``, ``2``, and ``4`` are valid; all others will cause an error to be |
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56 | reported. |
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57 | |
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58 | When ``length`` is not provided, it defaults to ``320`` which is twenty |
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59 | lines of output with sixteen bytes of output per line. |
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60 | |
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61 | When ``address`` is not provided, it defaults to ``0x00000000``. |
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62 | |
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63 | EXIT STATUS: |
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64 | This command always returns 0 to indicate success. |
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65 | |
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66 | NOTES: |
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67 | Dumping memory from a non-existent address may result in an unrecoverable |
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68 | program fault. |
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69 | |
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70 | EXAMPLES: |
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71 | The following is an example of how to use ``mdump``: |
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72 | |
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73 | .. code-block:: shell |
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74 | |
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75 | SHLL [/] $ mdump 0x10000 32 |
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76 | 0x0001000000 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ |
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77 | 0x0001001000 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ |
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78 | SHLL [/] $ mdump 0x02000000 32 |
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79 | 0x02000000A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 00 .H..)..3.."...!. |
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80 | 0x02000010A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 01 .H..)..3.."...!. |
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81 | SHLL [/] $ mdump 0x02001000 32 |
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82 | 0x0200100003 00 80 00 82 10 60 00-81 98 40 00 83 48 00 00 ......`.....H.. |
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83 | 0x0200101084 00 60 01 84 08 A0 07-86 10 20 01 87 28 C0 02 ..`....... ..(.. |
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84 | |
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85 | .. index:: CONFIGURE_SHELL_NO_COMMAND_MDUMP |
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86 | .. index:: CONFIGURE_SHELL_COMMAND_MDUMP |
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87 | |
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88 | CONFIGURATION: |
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89 | This command is included in the default shell command set. When building a |
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90 | custom command set, define ``CONFIGURE_SHELL_COMMAND_MDUMP`` to have this |
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91 | command included. |
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92 | |
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93 | This command can be excluded from the shell command set by defining |
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94 | ``CONFIGURE_SHELL_NO_COMMAND_MDUMP`` when all shell commands have been |
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95 | configured. |
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96 | |
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97 | .. index:: rtems_shell_rtems_main_mdump |
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98 | |
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99 | PROGRAMMING INFORMATION: |
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100 | The ``mdump`` is implemented by a C language function which has the |
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101 | following prototype: |
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102 | |
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103 | .. code-block:: c |
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104 | |
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105 | int rtems_shell_rtems_main_mdump( |
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106 | int argc, |
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107 | char **argv |
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108 | ); |
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109 | |
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110 | The configuration structure for the ``mdump`` has the following prototype: |
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111 | |
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112 | .. code-block:: c |
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113 | |
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114 | extern rtems_shell_cmd_t rtems_shell_MDUMP_Command; |
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115 | |
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116 | .. raw:: latex |
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117 | |
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118 | \clearpage |
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119 | |
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120 | .. _wdump: |
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121 | |
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122 | wdump - display contents of memory (word) |
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123 | ----------------------------------------- |
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124 | .. index:: wdump |
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125 | |
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126 | SYNOPSYS: |
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127 | .. code-block:: shell |
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128 | |
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129 | wdump [address [length]] |
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130 | |
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131 | DESCRIPTION: |
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132 | This command displays the contents of memory at the ``address`` and |
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133 | ``length`` in bytes specified on the command line. |
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134 | |
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135 | This command is equivalent to ``mdump address length 2``. |
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136 | |
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137 | When ``length`` is not provided, it defaults to ``320`` which is twenty |
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138 | lines of output with eight words of output per line. |
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139 | |
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140 | When ``address`` is not provided, it defaults to ``0x00000000``. |
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141 | |
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142 | EXIT STATUS: |
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143 | This command always returns 0 to indicate success. |
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144 | |
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145 | NOTES: |
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146 | Dumping memory from a non-existent address may result in an unrecoverable |
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147 | program fault. |
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148 | |
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149 | EXAMPLES: |
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150 | The following is an example of how to use ``wdump``: |
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151 | |
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152 | .. code-block:: shell |
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153 | |
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154 | SHLL [/] $ wdump 0x02010000 32 |
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155 | 0x02010000 0201 08D8 0201 08C0-0201 08AC 0201 0874 ...............t |
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156 | 0x02010010 0201 0894 0201 0718-0201 0640 0201 0798 ............... |
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157 | |
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158 | .. index:: CONFIGURE_SHELL_NO_COMMAND_WDUMP |
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159 | .. index:: CONFIGURE_SHELL_COMMAND_WDUMP |
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160 | |
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161 | CONFIGURATION: |
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162 | This command is included in the default shell command set. When building a |
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163 | custom command set, define ``CONFIGURE_SHELL_COMMAND_WDUMP`` to have this |
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164 | command included. |
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165 | |
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166 | This command can be excluded from the shell command set by defining |
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167 | ``CONFIGURE_SHELL_NO_COMMAND_WDUMP`` when all shell commands have been |
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168 | configured. |
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169 | |
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170 | .. index:: rtems_shell_rtems_main_wdump |
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171 | |
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172 | PROGRAMMING INFORMATION: |
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173 | The ``wdump`` is implemented by a C language function which has the |
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174 | following prototype: |
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175 | |
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176 | .. code-block:: c |
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177 | |
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178 | int rtems_shell_rtems_main_wdump( |
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179 | int argc, |
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180 | char **argv |
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181 | ); |
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182 | |
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183 | The configuration structure for the ``wdump`` has the following prototype: |
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184 | |
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185 | .. code-block:: c |
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186 | |
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187 | extern rtems_shell_cmd_t rtems_shell_WDUMP_Command; |
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188 | |
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189 | .. raw:: latex |
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190 | |
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191 | \clearpage |
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192 | |
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193 | .. _ldump: |
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194 | |
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195 | ldump - display contents of memory (longword) |
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196 | --------------------------------------------- |
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197 | .. index:: ldump |
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198 | |
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199 | SYNOPSYS: |
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200 | .. code-block:: shell |
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201 | |
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202 | ldump [address [length]] |
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203 | |
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204 | DESCRIPTION: |
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205 | This command displays the contents of memory at the ``address`` and |
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206 | ``length`` in bytes specified on the command line. |
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207 | |
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208 | This command is equivalent to ``mdump address length 4``. |
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209 | |
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210 | When ``length`` is not provided, it defaults to ``320`` which is twenty |
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211 | lines of output with four longwords of output per line. |
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212 | |
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213 | When ``address`` is not provided, it defaults to ``0x00000000``. |
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214 | |
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215 | EXIT STATUS: |
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216 | This command always returns 0 to indicate success. |
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217 | |
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218 | NOTES: |
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219 | Dumping memory from a non-existent address may result in an unrecoverable |
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220 | program fault. |
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221 | |
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222 | EXAMPLES: |
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223 | The following is an example of how to use ``ldump``: |
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224 | |
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225 | .. code-block:: shell |
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226 | |
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227 | SHLL [/] $ ldump 0x02010000 32 |
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228 | 0x02010000 020108D8 020108C0-020108AC 02010874 ...............t |
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229 | 0x02010010 020 0894 02010718-02010640 02010798 ............... |
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230 | |
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231 | .. index:: CONFIGURE_SHELL_NO_COMMAND_LDUMP |
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232 | .. index:: CONFIGURE_SHELL_COMMAND_LDUMP |
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233 | |
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234 | CONFIGURATION: |
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235 | This command is included in the default shell command set. When building a |
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236 | custom command set, define ``CONFIGURE_SHELL_COMMAND_LDUMP`` to have this |
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237 | command included. |
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238 | |
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239 | This command can be excluded from the shell command set by defining |
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240 | ``CONFIGURE_SHELL_NO_COMMAND_LDUMP`` when all shell commands have been |
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241 | configured. |
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242 | |
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243 | .. index:: rtems_shell_rtems_main_ldump |
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244 | |
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245 | PROGRAMMING INFORMATION: |
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246 | The ``ldump`` is implemented by a C language function which has the following |
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247 | prototype: |
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248 | |
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249 | .. code-block:: c |
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250 | |
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251 | int rtems_shell_rtems_main_ldump( |
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252 | int argc, |
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253 | char **argv |
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254 | ); |
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255 | |
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256 | The configuration structure for the ``ldump`` has the following prototype: |
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257 | |
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258 | .. code-block:: c |
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259 | |
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260 | extern rtems_shell_cmd_t rtems_shell_LDUMP_Command; |
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261 | |
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262 | .. raw:: latex |
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263 | |
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264 | \clearpage |
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265 | |
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266 | .. _medit: |
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267 | |
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268 | medit - modify contents of memory |
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269 | --------------------------------- |
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270 | .. index:: medit |
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271 | |
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272 | SYNOPSYS: |
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273 | .. code-block:: shell |
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274 | |
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275 | medit address value1 [value2 ... valueN] |
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276 | |
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277 | DESCRIPTION: |
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278 | This command is used to modify the contents of the memory starting at |
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279 | ``address`` using the octets specified by the parameters``value1`` through |
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280 | ``valueN``. |
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281 | |
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282 | EXIT STATUS: |
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283 | This command returns 0 on success and non-zero if an error is encountered. |
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284 | |
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285 | NOTES: |
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286 | Dumping memory from a non-existent address may result in an unrecoverable |
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287 | program fault. |
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288 | |
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289 | EXAMPLES: |
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290 | The following is an example of how to use ``medit``: |
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291 | |
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292 | .. code-block:: shell |
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293 | |
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294 | SHLL [/] $ mdump 0x02000000 32 |
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295 | 0x02000000 A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 00 .H..)..3.."...!. |
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296 | 0x02000010 A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 01 .H..)..3.."...!. |
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297 | SHLL [/] $ medit 0x02000000 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 |
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298 | SHLL [/] $ mdump 0x02000000 32 |
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299 | 0x02000000 01 02 03 04 05 06 07 08-09 00 22 BC A6 10 21 00 .........."...!. |
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300 | 0x02000010 A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 01 .H..)..3.."...!. |
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301 | |
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302 | .. index:: CONFIGURE_SHELL_NO_COMMAND_MEDIT |
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303 | .. index:: CONFIGURE_SHELL_COMMAND_MEDIT |
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304 | |
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305 | CONFIGURATION: |
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306 | This command is included in the default shell command set. When building a |
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307 | custom command set, define ``CONFIGURE_SHELL_COMMAND_MEDIT`` to have this |
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308 | command included. |
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309 | |
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310 | This command can be excluded from the shell command set by defining |
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311 | ``CONFIGURE_SHELL_NO_COMMAND_MEDIT`` when all shell commands have been |
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312 | configured. |
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313 | |
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314 | .. index:: rtems_shell_rtems_main_medit |
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315 | |
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316 | PROGRAMMING INFORMATION: |
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317 | The ``medit`` is implemented by a C language function which has the |
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318 | following prototype: |
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319 | |
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320 | .. code-block:: c |
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321 | |
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322 | int rtems_shell_rtems_main_medit( |
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323 | int argc, |
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324 | char **argv |
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325 | ); |
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326 | |
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327 | The configuration structure for the ``medit`` has the following prototype: |
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328 | |
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329 | .. code-block:: c |
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330 | |
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331 | extern rtems_shell_cmd_t rtems_shell_MEDIT_Command; |
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332 | |
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333 | .. raw:: latex |
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334 | |
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335 | \clearpage |
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336 | |
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337 | .. _mfill: |
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338 | |
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339 | mfill - file memory with pattern |
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340 | -------------------------------- |
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341 | .. index:: mfill |
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342 | |
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343 | SYNOPSYS: |
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344 | .. code-block:: shell |
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345 | |
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346 | mfill address length value |
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347 | |
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348 | DESCRIPTION: |
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349 | This command is used to fill the memory starting at ``address`` for the |
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350 | specified ``length`` in octets when the specified at``value``. |
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351 | |
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352 | EXIT STATUS: |
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353 | This command returns 0 on success and non-zero if an error is encountered. |
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354 | |
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355 | NOTES: |
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356 | Filling a non-existent address range may result in an unrecoverable program |
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357 | fault. Similarly overwriting interrupt vector tables, code space or |
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358 | critical data areas can be fatal as shown in the example. |
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359 | |
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360 | EXAMPLES: |
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361 | In this example, the address used (``0x23d89a0``) as the base address of |
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362 | the filled area is the end of the stack for the Idle thread. This address |
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363 | was determined manually using gdb and is very specific to this application |
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364 | and BSP. The first command in this example is an ``mdump`` to display the |
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365 | initial contents of this memory. We see that the first 8 bytes are 0xA5 |
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366 | which is the pattern used as a guard by the Stack Checker. On the first |
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367 | context switch after the pattern is overwritten by the ``mfill`` command, |
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368 | the Stack Checker detect the pattern has been corrupted and generates a |
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369 | fatal error. |
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370 | |
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371 | .. code-block:: shell |
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372 | |
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373 | SHLL [/] $ mdump 0x23d89a0 16 |
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374 | 0x023D89A0 A5 A5 A5 A5 A5 A5 A5 A5-FE ED F0 0D 0B AD 0D 06 ................ |
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375 | SHLL [/] $ mfill 0x23d89a0 13 0x5a |
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376 | SHLL [/] $ BLOWN STACK!!! Offending task(0x23D4418): id=0x09010001; name=0x0203D908 |
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377 | stack covers range 0x23D89A0 - 0x23D99AF (4112 bytes) |
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378 | Damaged pattern begins at 0x023D89A8 and is 16 bytes long |
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379 | |
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380 | .. index:: CONFIGURE_SHELL_NO_COMMAND_MFILL |
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381 | .. index:: CONFIGURE_SHELL_COMMAND_MFILL |
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382 | |
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383 | CONFIGURATION: |
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384 | This command is included in the default shell command set. When building a |
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385 | custom command set, define ``CONFIGURE_SHELL_COMMAND_MFILL`` to have this |
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386 | command included. |
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387 | |
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388 | This command can be excluded from the shell command set by defining |
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389 | ``CONFIGURE_SHELL_NO_COMMAND_MFILL`` when all shell commands have been |
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390 | configured. |
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391 | |
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392 | .. index:: rtems_shell_rtems_main_mfill |
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393 | |
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394 | PROGRAMMING INFORMATION: |
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395 | The ``mfill`` is implemented by a C language function which has the |
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396 | following prototype: |
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397 | |
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398 | .. code-block:: c |
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399 | |
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400 | int rtems_shell_rtems_main_mfill( |
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401 | int argc, |
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402 | char **argv |
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403 | ); |
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404 | |
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405 | The configuration structure for the ``mfill`` has the |
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406 | following prototype: |
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407 | |
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408 | .. code-block:: c |
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409 | |
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410 | extern rtems_shell_cmd_t rtems_shell_MFILL_Command; |
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411 | |
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412 | .. raw:: latex |
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413 | |
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414 | \clearpage |
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415 | |
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416 | .. _mmove: |
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417 | |
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418 | mmove - move contents of memory |
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419 | ------------------------------- |
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420 | .. index:: mmove |
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421 | |
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422 | SYNOPSYS: |
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423 | .. code-block:: shell |
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424 | |
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425 | mmove dst src length |
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426 | |
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427 | DESCRIPTION: |
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428 | This command is used to copy the contents of the memory starting at ``src`` |
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429 | to the memory located at ``dst`` for the specified ``length`` in octets. |
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430 | |
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431 | EXIT STATUS: |
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432 | This command returns 0 on success and non-zero if an error is encountered. |
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433 | |
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434 | NOTES: |
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435 | NONE |
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436 | |
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437 | EXAMPLES: |
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438 | The following is an example of how to use ``mmove``: |
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439 | |
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440 | .. code-block:: shell |
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441 | |
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442 | SHLL [/] $ mdump 0x023d99a0 16 |
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443 | 0x023D99A0 A5 A5 A5 A5 A5 A5 A5 A5-A5 A5 A5 A5 A5 A5 A5 A5 ................ |
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444 | SHLL [/] $ mdump 0x02000000 16 |
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445 | 0x02000000 A1 48 00 00 29 00 80 33-81 C5 22 BC A6 10 21 00 .H..)..3.."...!. |
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446 | SHLL [/] $ mmove 0x023d99a0 0x02000000 13 |
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447 | SHLL [/] $ mdump 0x023d99a0 16 |
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448 | 0x023D99A0 A1 48 00 00 29 00 80 33-81 C5 22 BC A6 A5 A5 A5 .H..)..3.."..... |
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449 | |
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450 | .. index:: CONFIGURE_SHELL_NO_COMMAND_MMOVE |
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451 | .. index:: CONFIGURE_SHELL_COMMAND_MMOVE |
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452 | |
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453 | CONFIGURATION: |
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454 | This command is included in the default shell command set. When building a |
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455 | custom command set, define ``CONFIGURE_SHELL_COMMAND_MMOVE`` to have this |
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456 | command included. |
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457 | |
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458 | This command can be excluded from the shell command set by defining |
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459 | ``CONFIGURE_SHELL_NO_COMMAND_MMOVE`` when all shell commands have been |
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460 | configured. |
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461 | |
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462 | .. index:: rtems_shell_rtems_main_mmove |
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463 | |
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464 | PROGRAMMING INFORMATION: |
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465 | The ``mmove`` is implemented by a C language function which has the |
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466 | following prototype: |
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467 | |
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468 | .. code-block:: c |
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469 | |
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470 | int rtems_shell_rtems_main_mmove( |
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471 | int argc, |
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472 | char **argv |
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473 | ); |
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474 | |
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475 | The configuration structure for the ``mmove`` has the following prototype: |
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476 | |
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477 | .. code-block:: c |
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478 | |
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479 | extern rtems_shell_cmd_t rtems_shell_MMOVE_Command; |
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480 | |
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481 | .. raw:: latex |
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482 | |
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483 | \clearpage |
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484 | |
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485 | .. _malloc: |
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486 | |
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487 | malloc - obtain information on C program heap |
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488 | --------------------------------------------- |
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489 | .. index:: malloc |
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490 | |
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491 | SYNOPSYS: |
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492 | .. code-block:: shell |
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493 | |
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494 | malloc [walk] |
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495 | |
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496 | DESCRIPTION: |
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497 | This command prints information about the current state of the C Program |
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498 | Heap used by the ``malloc()`` family of calls if no or invalid options are |
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499 | passed to the command. This includes the following information: |
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500 | |
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501 | - Number of free blocks |
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502 | |
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503 | - Largest free block |
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504 | |
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505 | - Total bytes free |
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506 | |
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507 | - Number of used blocks |
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508 | |
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509 | - Largest used block |
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510 | |
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511 | - Total bytes used |
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512 | |
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513 | - Size of the allocatable area in bytes |
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514 | |
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515 | - Minimum free size ever in bytes |
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516 | |
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517 | - Maximum number of free blocks ever |
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518 | |
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519 | - Maximum number of blocks searched ever |
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520 | |
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521 | - Lifetime number of bytes allocated |
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522 | |
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523 | - Lifetime number of bytes freed |
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524 | |
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525 | - Total number of searches |
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526 | |
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527 | - Total number of successful allocations |
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528 | |
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529 | - Total number of failed allocations |
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530 | |
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531 | - Total number of successful frees |
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532 | |
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533 | - Total number of successful resizes |
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534 | |
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535 | When the subcommand ``walk`` is specified, then a heap walk will be |
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536 | performed and information about each block is printed out. |
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537 | |
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538 | EXIT STATUS: |
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539 | This command returns 0 on success and non-zero if an error is encountered. |
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540 | |
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541 | NOTES: |
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542 | NONE |
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543 | |
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544 | EXAMPLES: |
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545 | The following is an example of how to use the ``malloc`` command. |
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546 | |
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547 | .. code-block:: shell |
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548 | |
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549 | SHLL [/] $ malloc |
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550 | C Program Heap and RTEMS Workspace are the same. |
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551 | Number of free blocks: 2 |
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552 | Largest free block: 266207504 |
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553 | Total bytes free: 266208392 |
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554 | Number of used blocks: 167 |
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555 | Largest used block: 16392 |
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556 | Total bytes used: 83536 |
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557 | Size of the allocatable area in bytes: 266291928 |
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558 | Minimum free size ever in bytes: 266207360 |
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559 | Maximum number of free blocks ever: 6 |
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560 | Maximum number of blocks searched ever: 5 |
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561 | Lifetime number of bytes allocated: 91760 |
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562 | Lifetime number of bytes freed: 8224 |
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563 | Total number of searches: 234 |
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564 | Total number of successful allocations: 186 |
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565 | Total number of failed allocations: 0 |
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566 | Total number of successful frees: 19 |
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567 | Total number of successful resizes: 0 |
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568 | SHLL [/] $ malloc walk |
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569 | malloc walk |
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570 | PASS[0]: page size 8, min block size 48 |
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571 | area begin 0x00210210, area end 0x0FFFC000 |
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572 | first block 0x00210214, last block 0x0FFFBFDC |
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573 | first free 0x00228084, last free 0x00228354 |
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574 | PASS[0]: block 0x00210214: size 88 |
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575 | ... |
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576 | PASS[0]: block 0x00220154: size 144 |
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577 | PASS[0]: block 0x002201E4: size 168, prev 0x002205BC, next 0x00228354 (= last free) |
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578 | PASS[0]: block 0x0022028C: size 168, prev_size 168 |
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579 | ... |
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580 | PASS[0]: block 0x00226E7C: size 4136 |
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581 | PASS[0]: block 0x00227EA4: size 408, prev 0x00228084 (= first free), next 0x00226CE4 |
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582 | PASS[0]: block 0x0022803C: size 72, prev_size 408 |
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583 | PASS[0]: block 0x00228084: size 648, prev 0x0020F75C (= head), next 0x00227EA4 |
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584 | PASS[0]: block 0x0022830C: size 72, prev_size 648 |
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585 | PASS[0]: block 0x00228354: size 266157192, prev 0x002201E4, next 0x0020F75C (= tail) |
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586 | PASS[0]: block 0x0FFFBFDC: size 4028711480, prev_size 266157192 |
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587 | |
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588 | .. index:: CONFIGURE_SHELL_NO_COMMAND_MALLOC |
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589 | .. index:: CONFIGURE_SHELL_COMMAND_MALLOC |
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590 | |
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591 | CONFIGURATION: |
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592 | This command is included in the default shell command set. When building a |
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593 | custom command set, define ``CONFIGURE_SHELL_COMMAND_MALLOC`` to have this |
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594 | command included. |
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595 | |
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596 | This command can be excluded from the shell command set by defining |
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597 | ``CONFIGURE_SHELL_NO_COMMAND_MALLOC`` when all shell commands have been |
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598 | configured. |
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599 | |
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600 | .. index:: rtems_shell_rtems_main_malloc |
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601 | |
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602 | PROGRAMMING INFORMATION: |
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603 | The ``malloc`` is implemented by a C language function which has the |
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604 | following prototype: |
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605 | |
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606 | .. code-block:: c |
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607 | |
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608 | int rtems_shell_rtems_main_malloc( |
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609 | int argc, |
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610 | char **argv |
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611 | ); |
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612 | |
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613 | The configuration structure for the ``malloc`` has the following prototype: |
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614 | |
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615 | .. code-block:: c |
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616 | |
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617 | extern rtems_shell_cmd_t rtems_shell_MALLOC_Command; |
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